<template>
    <view>
        <slot v-if="!nodes.length" />
        <!--#ifdef APP-PLUS-NVUE-->
        <web-view id="_top" ref="web" :style="'margin-top:-2px;height:'+height+'px'" @onPostMessage="_message" />
        <!--#endif-->
        <!--#ifndef APP-PLUS-NVUE-->
        <view id="_top" :style="showAm+(selectable?';user-select:text;-webkit-user-select:text':'')">
            <!--#ifdef H5 || MP-360-->
            <div :id="'rtf'+uid"></div>
            <!--#endif-->
            <!--#ifndef H5 || MP-360-->
            <trees :nodes="nodes" :lazyLoad="lazyLoad" :loading="loadingImg" />
            <!--#endif-->
        </view>
        <!--#endif-->
    </view>
</template>

<script>
    var search;
    // #ifndef H5 || APP-PLUS-NVUE || MP-360
    import trees from './libs/trees';
    var cache = {},
        // #ifdef MP-WEIXIN || MP-TOUTIAO
        fs = uni.getFileSystemManager ? uni.getFileSystemManager() : null,
        // #endif
        Parser = require('./libs/MpHtmlParser.js');
    var dom;
    // 计算 cache 的 key
    function hash(str) {
        for (var i = str.length, val = 5381; i--;)
            val += (val << 5) + str.charCodeAt(i);
        return val;
    }
    // #endif
    // #ifdef H5 || APP-PLUS-NVUE || MP-360
    var {
        windowWidth,
        platform
    } = uni.getSystemInfoSync(),
        cfg = require('./libs/config.js');
    // #endif
    // #ifdef APP-PLUS-NVUE
    var weexDom = weex.requireModule('dom');
    // #endif
    /**
     * Parser 富文本组件
     * @tutorial https://github.com/jin-yufeng/Parser
     * @property {String} html 富文本数据
     * @property {Boolean} autopause 是否在播放一个视频时自动暂停其他视频
     * @property {Boolean} autoscroll 是否自动给所有表格添加一个滚动层
     * @property {Boolean} autosetTitle 是否自动将 title 标签中的内容设置到页面标题
     * @property {Number} compress 压缩等级
     * @property {String} domain 图片、视频等链接的主域名
     * @property {Boolean} lazyLoad 是否开启图片懒加载
     * @property {String} loadingImg 图片加载完成前的占位图
     * @property {Boolean} selectable 是否开启长按复制
     * @property {Object} tagStyle 标签的默认样式
     * @property {Boolean} showWithAnimation 是否使用渐显动画
     * @property {Boolean} useAnchor 是否使用锚点
     * @property {Boolean} useCache 是否缓存解析结果
     * @event {Function} parse 解析完成事件
     * @event {Function} load dom 加载完成事件
     * @event {Function} ready 所有图片加载完毕事件
     * @event {Function} error 错误事件
     * @event {Function} imgtap 图片点击事件
     * @event {Function} linkpress 链接点击事件
     * @author JinYufeng
     * @version 20201029
     * @listens MIT
     */
    export default {
        name: 'parser',
        data() {
            return {
                // #ifdef H5 || MP-360
                uid: this._uid,
                // #endif
                // #ifdef APP-PLUS-NVUE
                height: 1,
                // #endif
                // #ifndef APP-PLUS-NVUE
                showAm: '',
                // #endif
                nodes: []
            }
        },
        // #ifndef H5 || APP-PLUS-NVUE || MP-360
        components: {
            trees
        },
        // #endif
        props: {
            html: String,
            autopause: {
                type: Boolean,
                default: true
            },
            autoscroll: Boolean,
            autosetTitle: {
                type: Boolean,
                default: true
            },
            // #ifndef H5 || APP-PLUS-NVUE || MP-360
            compress: Number,
            loadingImg: String,
            useCache: Boolean,
            // #endif
            domain: String,
            lazyLoad: Boolean,
            selectable: Boolean,
            tagStyle: Object,
            showWithAnimation: Boolean,
            useAnchor: Boolean
        },
        watch: {
            html(html) {
                this.setContent(html);
            }
        },
        created() {
            // 图片数组
            this.imgList = [];
            this.imgList.each = function(f) {
                for (var i = 0, len = this.length; i < len; i++)
                    this.setItem(i, f(this[i], i, this));
            }
            this.imgList.setItem = function(i, src) {
                if (i == void 0 || !src) return;
                // #ifndef MP-ALIPAY || APP-PLUS
                // 去重
                if (src.indexOf('http') == 0 && this.includes(src)) {
                    var newSrc = src.split('://')[0];
                    for (var j = newSrc.length, c; c = src[j]; j++) {
                        if (c == '/' && src[j - 1] != '/' && src[j + 1] != '/') break;
                        newSrc += Math.random() > 0.5 ? c.toUpperCase() : c;
                    }
                    newSrc += src.substr(j);
                    return this[i] = newSrc;
                }
                // #endif
                this[i] = src;
                // 暂存 data src
                if (src.includes('data:image')) {
                    var filePath, info = src.match(/data:image\/(\S+?);(\S+?),(.+)/);
                    if (!info) return;
                    // #ifdef MP-WEIXIN || MP-TOUTIAO
                    filePath = `${wx.env.USER_DATA_PATH}/${Date.now()}.${info[1]}`;
                    fs && fs.writeFile({
                        filePath,
                        data: info[3],
                        encoding: info[2],
                        success: () => this[i] = filePath
                    })
                    // #endif
                    // #ifdef APP-PLUS
                    filePath = `_doc/parser_tmp/${Date.now()}.${info[1]}`;
                    var bitmap = new plus.nativeObj.Bitmap();
                    bitmap.loadBase64Data(src, () => {
                        bitmap.save(filePath, {}, () => {
                            bitmap.clear()
                            this[i] = filePath;
                        })
                    })
                    // #endif
                }
            }
        },
        mounted() {
            // #ifdef H5 || MP-360
            this.document = document.getElementById('rtf' + this._uid);
            // #endif
            // #ifndef H5 || APP-PLUS-NVUE || MP-360
            if (dom) this.document = new dom(this);
            // #endif
            if (search) this.search = args => search(this, args);
            // #ifdef APP-PLUS-NVUE
            this.document = this.$refs.web;
            setTimeout(() => {
                // #endif
                if (this.html) this.setContent(this.html);
                // #ifdef APP-PLUS-NVUE
            }, 30)
            // #endif
        },
        beforeDestroy() {
            // #ifdef H5 || MP-360
            if (this._observer) this._observer.disconnect();
            // #endif
            this.imgList.each(src => {
                // #ifdef APP-PLUS
                if (src && src.includes('_doc')) {
                    plus.io.resolveLocalFileSystemURL(src, entry => {
                        entry.remove();
                    });
                }
                // #endif
                // #ifdef MP-WEIXIN || MP-TOUTIAO
                if (src && src.includes(uni.env.USER_DATA_PATH))
                    fs && fs.unlink({
                        filePath: src
                    })
                // #endif
            })
            clearInterval(this._timer);
        },
        methods: {
            // 设置富文本内容
            setContent(html, append) {
                // #ifdef APP-PLUS-NVUE
                if (!html)
                    return this.height = 1;
                if (append)
                    this.$refs.web.evalJs("var b=document.createElement('div');b.innerHTML='" + html.replace(/'/g, "\\'") +
                        "';document.getElementById('parser').appendChild(b)");
                else {
                    html =
                        '<meta charset="utf-8" /><meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no"><style>html,body{width:100%;height:100%;overflow:hidden}body{margin:0}</style><base href="' +
                        this.domain + '"><div id="parser"' + (this.selectable ? '>' : ' style="user-select:none">') + this._handleHtml(html).replace(/\n/g, '\\n') +
                        '</div><script>"use strict";function e(e){if(window.__dcloud_weex_postMessage||window.__dcloud_weex_){var t={data:[e]};window.__dcloud_weex_postMessage?window.__dcloud_weex_postMessage(t):window.__dcloud_weex_.postMessage(JSON.stringify(t))}}document.body.onclick=function(){e({action:"click"})},' +
                        (this.showWithAnimation ? 'document.body.style.animation="_show .5s",' : '') +
                        'setTimeout(function(){e({action:"load",text:document.body.innerText,height:document.getElementById("parser").scrollHeight})},50);\x3c/script>';
                    if (platform == 'android') html = html.replace(/%/g, '%25');
                    this.$refs.web.evalJs("document.write('" + html.replace(/'/g, "\\'") + "');document.close()");
                }
                this.$refs.web.evalJs(
                    'var t=document.getElementsByTagName("title");t.length&&e({action:"getTitle",title:t[0].innerText});for(var o,n=document.getElementsByTagName("style"),r=1;o=n[r++];)o.innerHTML=o.innerHTML.replace(/body/g,"#parser");for(var a,c=document.getElementsByTagName("img"),s=[],i=0==c.length,d=0,l=0,g=0;a=c[l];l++)parseInt(a.style.width||a.getAttribute("width"))>' +
                    windowWidth + '&&(a.style.height="auto"),a.onload=function(){++d==c.length&&(i=!0)},a.onerror=function(){++d==c.length&&(i=!0),' + (cfg.errorImg ? 'this.src="' + cfg.errorImg + '",' : '') +
                    'e({action:"error",source:"img",target:this})},a.hasAttribute("ignore")||"A"==a.parentElement.nodeName||(a.i=g++,s.push(a.getAttribute("original-src")||a.src||a.getAttribute("data-src")),a.onclick=function(t){t.stopPropagation(),e({action:"preview",img:{i:this.i,src:this.src}})});e({action:"getImgList",imgList:s});for(var u,m=document.getElementsByTagName("a"),f=0;u=m[f];f++)u.onclick=function(m){m.stopPropagation();var t,o=this.getAttribute("href");if("#"==o[0]){var n=document.getElementById(o.substr(1));n&&(t=n.offsetTop)}return e({action:"linkpress",href:o,offset:t}),!1};for(var h,y=document.getElementsByTagName("video"),v=0;h=y[v];v++)h.style.maxWidth="100%",h.onerror=function(){e({action:"error",source:"video",target:this})}' +
                    (this.autopause ? ',h.onplay=function(){for(var e,t=0;e=y[t];t++)e!=this&&e.pause()}' : '') +
                    ';for(var _,p=document.getElementsByTagName("audio"),w=0;_=p[w];w++)_.onerror=function(){e({action:"error",source:"audio",target:this})};' +
                    (this.autoscroll ? 'for(var T,E=document.getElementsByTagName("table"),B=0;T=E[B];B++){var N=document.createElement("div");N.style.overflow="scroll",T.parentNode.replaceChild(N,T),N.appendChild(T)}' : '') +
                    'var x=document.getElementById("parser");clearInterval(window.timer),window.timer=setInterval(function(){i&&clearInterval(window.timer),e({action:"ready",ready:i,height:x.scrollHeight})},350)'
                )
                this.nodes = [1];
                // #endif
                // #ifdef H5 || MP-360
                if (!html) {
                    if (this.rtf && !append) this.rtf.parentNode.removeChild(this.rtf);
                    return;
                }
                var div = document.createElement('div');
                if (!append) {
                    if (this.rtf) this.rtf.parentNode.removeChild(this.rtf);
                    this.rtf = div;
                } else {
                    if (!this.rtf) this.rtf = div;
                    else this.rtf.appendChild(div);
                }
                div.innerHTML = this._handleHtml(html, append);
                for (var styles = this.rtf.getElementsByTagName('style'), i = 0, style; style = styles[i++];) {
                    style.innerHTML = style.innerHTML.replace(/body/g, '#rtf' + this._uid);
                    style.setAttribute('scoped', 'true');
                }
                // 懒加载
                if (!this._observer && this.lazyLoad && IntersectionObserver) {
                    this._observer = new IntersectionObserver(changes => {
                        for (let item, i = 0; item = changes[i++];) {
                            if (item.isIntersecting) {
                                item.target.src = item.target.getAttribute('data-src');
                                item.target.removeAttribute('data-src');
                                this._observer.unobserve(item.target);
                            }
                        }
                    }, {
                        rootMargin: '500px 0px 500px 0px'
                    })
                }
                var _ts = this;
                // 获取标题
                var title = this.rtf.getElementsByTagName('title');
                if (title.length && this.autosetTitle)
                    uni.setNavigationBarTitle({
                        title: title[0].innerText
                    })
                // 填充 domain
                var fill = target => {
                    var src = target.getAttribute('src');
                    if (this.domain && src) {
                        if (src[0] == '/') {
                            if (src[1] == '/')
                                target.src = (this.domain.includes('://') ? this.domain.split('://')[0] : '') + ':' + src;
                            else target.src = this.domain + src;
                        } else if (!src.includes('://') && src.indexOf('data:') != 0) target.src = this.domain + '/' + src;
                    }
                }
                // 图片处理
                this.imgList.length = 0;
                var imgs = this.rtf.getElementsByTagName('img');
                for (let i = 0, j = 0, img; img = imgs[i]; i++) {
                    if (parseInt(img.style.width || img.getAttribute('width')) > windowWidth)
                        img.style.height = 'auto';
                    fill(img);
                    if (!img.hasAttribute('ignore') && img.parentElement.nodeName != 'A') {
                        img.i = j++;
                        _ts.imgList.push(img.getAttribute('original-src') || img.src || img.getAttribute('data-src'));
                        img.onclick = function(e) {
                            e.stopPropagation();
                            var preview = true;
                            this.ignore = () => preview = false;
                            _ts.$emit('imgtap', this);
                            if (preview) {
                                // uni.previewImage({
                                //     current: this.i,
                                //     urls: _ts.imgList
                                // });
                            }
                        }
                    }
                    img.onerror = function() {
                        if (cfg.errorImg)
                            _ts.imgList[this.i] = this.src = cfg.errorImg;
                        _ts.$emit('error', {
                            source: 'img',
                            target: this
                        });
                    }
                    if (_ts.lazyLoad && this._observer && img.src && img.i != 0) {
                        img.setAttribute('data-src', img.src);
                        img.removeAttribute('src');
                        this._observer.observe(img);
                    }
                }
                // 链接处理
                var links = this.rtf.getElementsByTagName('a');
                for (var link of links) {
                    link.onclick = function(e) {
                        e.stopPropagation();
                        var jump = true,
                            href = this.getAttribute('href');
                        _ts.$emit('linkpress', {
                            href,
                            ignore: () => jump = false
                        });
                        if (jump && href) {
                            if (href[0] == '#') {
                                if (_ts.useAnchor) {
                                    _ts.navigateTo({
                                        id: href.substr(1)
                                    })
                                }
                            } else if (href.indexOf('http') == 0 || href.indexOf('//') == 0)
                                return true;
                            else
                                uni.navigateTo({
                                    url: href
                                })
                        }
                        return false;
                    }
                }
                // 视频处理
                var videos = this.rtf.getElementsByTagName('video');
                _ts.videoContexts = videos;
                for (let video, i = 0; video = videos[i++];) {
                    fill(video);
                    video.style.maxWidth = '100%';
                    video.onerror = function() {
                        _ts.$emit('error', {
                            source: 'video',
                            target: this
                        });
                    }
                    video.onplay = function() {
                        if (_ts.autopause)
                            for (let item, i = 0; item = _ts.videoContexts[i++];)
                                if (item != this) item.pause();
                    }
                }
                // 音频处理
                var audios = this.rtf.getElementsByTagName('audio');
                for (var audio of audios) {
                    fill(audio);
                    audio.onerror = function() {
                        _ts.$emit('error', {
                            source: 'audio',
                            target: this
                        });
                    }
                }
                // 表格处理
                if (this.autoscroll) {
                    var tables = this.rtf.getElementsByTagName('table');
                    for (var table of tables) {
                        let div = document.createElement('div');
                        div.style.overflow = 'scroll';
                        table.parentNode.replaceChild(div, table);
                        div.appendChild(table);
                    }
                }
                if (!append) this.document.appendChild(this.rtf);
                this.$nextTick(() => {
                    this.nodes = [1];
                    this.$emit('load');
                });
                setTimeout(() => this.showAm = '', 500);
                // #endif
                // #ifndef APP-PLUS-NVUE
                // #ifndef H5 || MP-360
                var nodes;
                if (!html) return this.nodes = [];
                var parser = new Parser(html, this);
                // 缓存读取
                if (this.useCache) {
                    var hashVal = hash(html);
                    if (cache[hashVal])
                        nodes = cache[hashVal];
                    else {
                        nodes = parser.parse();
                        cache[hashVal] = nodes;
                    }
                } else nodes = parser.parse();
                this.$emit('parse', nodes);
                if (append) this.nodes = this.nodes.concat(nodes);
                else this.nodes = nodes;
                if (nodes.length && nodes.title && this.autosetTitle)
                    uni.setNavigationBarTitle({
                        title: nodes.title
                    })
                if (this.imgList) this.imgList.length = 0;
                this.videoContexts = [];
                this.$nextTick(() => {
                    (function f(cs) {
                        for (var i = cs.length; i--;) {
                            if (cs[i].top) {
                                cs[i].controls = [];
                                cs[i].init();
                                f(cs[i].$children);
                            }
                        }
                    })(this.$children)
                    this.$emit('load');
                })
                // #endif
                var height;
                clearInterval(this._timer);
                this._timer = setInterval(() => {
                    // #ifdef H5 || MP-360
                    this.rect = this.rtf.getBoundingClientRect();
                    // #endif
                    // #ifndef H5 || MP-360
                    uni.createSelectorQuery().in(this)
                        .select('#_top').boundingClientRect().exec(res => {
                            if (!res) return;
                            this.rect = res[0];
                            // #endif
                            if (this.rect.height == height) {
                                this.$emit('ready', this.rect)
                                clearInterval(this._timer);
                            }
                            height = this.rect.height;
                            // #ifndef H5 || MP-360
                        });
                    // #endif
                }, 350);
                if (this.showWithAnimation && !append) this.showAm = 'animation:_show .5s';
                // #endif
            },
            // 获取文本内容
            getText(ns = this.nodes) {
                var txt = '';
                // #ifdef APP-PLUS-NVUE
                txt = this._text;
                // #endif
                // #ifdef H5 || MP-360
                txt = this.rtf.innerText;
                // #endif
                // #ifndef H5 || APP-PLUS-NVUE || MP-360
                for (var i = 0, n; n = ns[i++];) {
                    if (n.type == 'text') txt += n.text.replace(/&nbsp;/g, '\u00A0').replace(/&lt;/g, '<').replace(/&gt;/g, '>')
                        .replace(/&amp;/g, '&');
                    else if (n.type == 'br') txt += '\n';
                    else {
                        // 块级标签前后加换行
                        var block = n.name == 'p' || n.name == 'div' || n.name == 'tr' || n.name == 'li' || (n.name[0] == 'h' && n.name[1] >
                            '0' && n.name[1] < '7');
                        if (block && txt && txt[txt.length - 1] != '\n') txt += '\n';
                        if (n.children) txt += this.getText(n.children);
                        if (block && txt[txt.length - 1] != '\n') txt += '\n';
                        else if (n.name == 'td' || n.name == 'th') txt += '\t';
                    }
                }
                // #endif
                return txt;
            },
            // 锚点跳转
            in (obj) {
                if (obj.page && obj.selector && obj.scrollTop) this._in = obj;
            },
            navigateTo(obj) {
                if (!this.useAnchor) return obj.fail && obj.fail('Anchor is disabled');
                // #ifdef APP-PLUS-NVUE
                if (!obj.id)
                    weexDom.scrollToElement(this.$refs.web);
                else
                    this.$refs.web.evalJs('var pos=document.getElementById("' + obj.id +
                        '");if(pos)post({action:"linkpress",href:"#",offset:pos.offsetTop+' + (obj.offset || 0) + '})');
                obj.success && obj.success();
                // #endif
                // #ifndef APP-PLUS-NVUE
                var d = ' ';
                // #ifdef MP-WEIXIN || MP-QQ || MP-TOUTIAO
                d = '>>>';
                // #endif
                var selector = uni.createSelectorQuery().in(this._in ? this._in.page : this).select((this._in ? this._in.selector :
                    '#_top') + (obj.id ? `${d}#${obj.id},${this._in?this._in.selector:'#_top'}${d}.${obj.id}` : '')).boundingClientRect();
                if (this._in) selector.select(this._in.selector).scrollOffset().select(this._in.selector).boundingClientRect();
                else selector.selectViewport().scrollOffset();
                selector.exec(res => {
                    if (!res[0]) return obj.fail && obj.fail('Label not found')
                    var scrollTop = res[1].scrollTop + res[0].top - (res[2] ? res[2].top : 0) + (obj.offset || 0);
                    if (this._in) this._in.page[this._in.scrollTop] = scrollTop;
                    else uni.pageScrollTo({
                        scrollTop,
                        duration: 300
                    })
                    obj.success && obj.success();
                })
                // #endif
            },
            // 获取视频对象
            getVideoContext(id) {
                // #ifndef APP-PLUS-NVUE
                if (!id) return this.videoContexts;
                else
                    for (var i = this.videoContexts.length; i--;)
                        if (this.videoContexts[i].id == id) return this.videoContexts[i];
                // #endif
            },
            // #ifdef H5 || APP-PLUS-NVUE || MP-360
            _handleHtml(html, append) {
                if (!append) {
                    // 处理 tag-style 和 userAgentStyles
                    var style = '<style>@keyframes _show{0%{opacity:0}100%{opacity:1}}img{max-width:100%;display:block}';
                    for (var item in cfg.userAgentStyles)
                        style += `${item}{${cfg.userAgentStyles[item]}}`;
                    for (item in this.tagStyle)
                        style += `${item}{${this.tagStyle[item]}}`;
                    style += '</style>';
                    html = style + html;
                }
                // 处理 rpx
                if (html.includes('rpx'))
                    html = html.replace(/[0-9.]+\s*rpx/g, $ => (parseFloat($) * windowWidth / 750) + 'px');
                return html;
            },
            // #endif
            // #ifdef APP-PLUS-NVUE
            _message(e) {
                // 接收 web-view 消息
                var d = e.detail.data[0];
                switch (d.action) {
                    case 'load':
                        this.$emit('load');
                        this.height = d.height;
                        this._text = d.text;
                        break;
                    case 'getTitle':
                        if (this.autosetTitle)
                            uni.setNavigationBarTitle({
                                title: d.title
                            })
                        break;
                    case 'getImgList':
                        this.imgList.length = 0;
                        for (var i = d.imgList.length; i--;)
                            this.imgList.setItem(i, d.imgList[i]);
                        break;
                    case 'preview':
                        var preview = true;
                        d.img.ignore = () => preview = false;
                        this.$emit('imgtap', d.img);
                        if (preview)
                            // uni.previewImage({
                            //     current: d.img.i,
                            //     urls: this.imgList
                            // })
                        break;
                    case 'linkpress':
                        var jump = true,
                            href = d.href;
                        this.$emit('linkpress', {
                            href,
                            ignore: () => jump = false
                        })
                        if (jump && href) {
                            if (href[0] == '#') {
                                if (this.useAnchor)
                                    weexDom.scrollToElement(this.$refs.web, {
                                        offset: d.offset
                                    })
                            } else if (href.includes('://'))
                                plus.runtime.openWeb(href);
                            else
                                uni.navigateTo({
                                    url: href
                                })
                        }
                        break;
                    case 'error':
                        if (d.source == 'img' && cfg.errorImg)
                            this.imgList.setItem(d.target.i, cfg.errorImg);
                        this.$emit('error', {
                            source: d.source,
                            target: d.target
                        })
                        break;
                    case 'ready':
                        this.height = d.height;
                        if (d.ready) uni.createSelectorQuery().in(this).select('#_top').boundingClientRect().exec(res => {
                            this.rect = res[0];
                            this.$emit('ready', res[0]);
                        })
                        break;
                    case 'click':
                        this.$emit('click');
                        this.$emit('tap');
                }
            },
            // #endif
        }
    }
</script>

<style>
    @keyframes _show {
        0% {
            opacity: 0;
        }

        100% {
            opacity: 1;
        }
    }

    /* #ifdef MP-WEIXIN */
    :host {
        display: block;
        overflow: auto;
        -webkit-overflow-scrolling: touch;
    }

    /* #endif */
</style>
